Conductive material for connecting parts

Abstract

An electroconductive material for a connection component have a base member made of a copper alloy plate, a Ni coating layer, a Cu-Sn alloy coating layer, and a Sn coating layer. A surface of the material is subjected to reflow treatment. The base member surface is roughened. The Cu-Sn alloy coating layer is partially exposed from the outside surface of the Sn coating layer. Regions of the Cu-Sn alloy coating layer exposed to the outside surface of the Sn coating layer have random microstructures distributed irregularly between portions of the Sn coating layer and streak microstructures extending in parallel to a rolled direction of the base member. The streak microstructures having a length of 50 µm or more and a width of 10 µm or less are contained in a number of 35 or more per 1 mm 2 .

Description

[0001] This application claims priority based on Japanese Patent Application No. 2012-078748, and the entire disclosure thereof is referred to in this application. technical field [0002] The present invention relates to a conductive material for connecting parts such as connector terminals mainly used in the automotive field and the general civilian field, and particularly relates to the reduction of friction during insertion and removal of male and female terminals and micro-sliding wear during use. Conductive material for reduced strip Sn-plated connecting parts. Background technique [0003] In the electrical equipment field of motor vehicles, due to the multi-purpose and high-level electronic control, the multi-polarization of connectors increases the insertion force of connectors in the assembly process of motor vehicles, and the labor burden of practitioners increases. For this reason, lower insertion force of the connector is required. [0004] In order to lower th...

AI Technical Summary

Problems solved by technology

However, when the contact pressure is lowered, slight sliding occurs between the male terminal and the female terminal due to the vibration of the engine of the vehicle and the vibration of running, and the Sn plating on the surface of the terminal wears off.

Abrasion powder generated by this wear enters the contact part and oxidizes, resulting in an increase in contact resistance and heat generation

In order to prevent this micro-sliding wear phenomenon, it is effective to increase the contact pressure to a certain extent, but when the contact pressure is increased, the insertion force also increases, so there is a limit to increasing the contact pressure

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